ML20028D936
| ML20028D936 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/14/1983 |
| From: | Van Vliet J Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8301200098 | |
| Download: ML20028D936 (6) | |
Text
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UNITED STATES
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g NUCLEAR REGULATORY COMMISSION 5
- l WASHINGTON, D. C. 20555
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JAft 141993 Docket No.,50-289 FACILITY: THREE MILE ISLAND, UNIT NO.1 (TMI-1)
LICENSEE: GPU NUCLEAR CORPORATION (GPUN)
SUBJECT:
SUMMARY
OF MEETING WITH GPUN ON JANUARY 7,1983 CONCERNITE SEISMIC QUALIFICATION OF THE AUXILIARY FEEDWATER SYSTEM (AFW) AT TMI-l
Background
By letter dated November 16, 1982, the staff forwarded a Technical Evaluation Report (TER) to GPUN which addressed the seismic qualifi-cation of AFW at TMI-1. The staff's letter afforded GPUN an oppor-tunity to review and comment on the TER prior to preparation of
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the staff's Safety Evaluation. By letter dated December 20,'1982, GPUN responded. The purpose of the Janusry 7 neeting was to discuss.
the TER and the GPUN response. A schematic diagran of the Ti1I-l AFW is enclosed to facilitate the following discussion.
Discussion Water Source The staff questioned the procedures for manual isolation of' C0V-14A/B and COV-lll A/B on any recognizable seismic event in light of un-qualified CST level alarms and instruments. GPUN explained that initiation of operator action did not depend solely on recognition of seismic events, but would also be initiated on a CST level below TS limits or on a zero indication. GPUN explained that the operator has 20 minutes to coniplete the procedure, that the valves are five minutes from the control room and thatthe valves are within '50 feet of each other. The staff questioned the seismic qualification of the CST cross-tie line. GPUN stated that the cross-tie line is seismically qualified. GPUN confirmed that seismic power supplies would be pro-vided for C0V-14A/B and COV-lllA/B as a long term action. GPUN stated that C0V-10A/B are nonnally open MOVs that fail as-is.
AFW Pumps The staff questioned the failure modes of the electric-to-pneumatic converters, EFV-8A/B and EFV-30A/B with respect to S/G overfill and deadheading of the AFW punps. GPUN agreed to research and respond to these questions. GPUN stated that ruptures of the non-seismic EFP recirculation lines would not create spray or flooding hazards.
Steam Valves A number of the AFW turbine steam supply valves are not seismically 8301200098 830114 PDR ADOCK 05000289 p
TMI-l qualified. The GPUN position is that no upgrade is necessary'since the AFW steam turbine function can be sacrificed during a seismic event. The GPUN position is based on previously performed analyses.
With respect to MSIVs and bypass valves, GPUN maintains that no seismic upgrade is necessary since the valves are not required to shut on a seismic event.
Connected Branch Piping GPUN stated that the acceptance criteria for connected branch piping walkdowns was three-directional mstraint and ensuring that no con-figurations existed that could create a " leveraging" effect on a section of pipe. The staff pointed out that its acceptance criteria included double seismic valve protection on branch lines.
GPUN stated it was not aware of that criteria.
P Instrument Air Supply Lines Consensus agreement was reached that the two hour instrument air bottle installation was seismically qualified. The staff questioned the j
qualification status of the instrument air lines for the two hour supply. GPUN stated that the air lines were seismically qualified.
Action Items Staff Actions 1.
Identify the reference that brought into question the seismic quali-fication of the cross-tie line.
GPUN Actions 1.
Provide a date when the actions listed below could be expected to be complete.
(By subsequent telephone conversation, a date of January 28, 1983 was set by GPUN and the staff.)
2.
Verify and describe the analysis that demonstrates an adequate water supply exists to achieve cold shutdown. Considerations should include:
I a.
time required for operator action to isolate break and establish flow l
b.
access to valves (flooding, etc.)
c.
indications available to the operator d.
bounding flow (hotwell vacuum vs. break to atmosphere) 3.
Confirm that the cross-tie line is seismic.
4.
Confirm that CST level instruments fail low in all failure modes.
l S.
Comit to rack out breakers for C0V-10A/B.
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6.
Confirm the seismic replacement of recirculation flow switches for l
EFV-8A/B during Cycle 6 refueling.
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<,w THI-l 7.
Address operator actions to prevent, and. consequences of, S/G overfill by AFd. Address deadheading of ARI pumps (to include, closure of flow control valves).
8.
Describe the electric-to-pneumatic. converter failure. modes.
9.
Provide reference to the analyses. determining ARI electrical pump capacity and required AR1 flow.
- 10. Provide reference to analyses showing MSIV closure is not required.
(Address bypass valves.)
- 11. Identify branch piping where, double valve protection does not exist, and provide justification for each case.
- 12. Provide reference to selimic status of instrument air lines for the two hour air supply.
- 13. Address AIM support systems.such as HVAC, service water, lube oil, e tc.
gW I
James A. Van Vliet, Project !!anager Operating Reactors Branch #4 _
Division of Licensing
Enclosures:
1.
List of Attendees 2.
AIM System Schematic Diagram cc w/ enclosures:
See next page i
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SUMMARY
DISTRIBUTION Licensee:
GPU Nuclear Corporation
- Copies also sent to those people on service (cc) list for subject plant (s).
C nneket Fi NRC PDR L PDR ORB #4 Rdg Glainas JStolz Project Manager-JV n Vliet Licensing AssistanbRIngram He1temes, AE0D IE SShowe (PWR) or CThayer (BWR), IE Meeting Sumary File-0RB#4 RFraley, ACRS-10 Program Support Branch-ORAB, Rm. 542 BGrimes, DEP SSchwartz, DEP SRamos, EPDB FPagano, EPLB Meeting Participants Fm. NRC:
JTBeard JSWermiel RLobel MChiramal fled El-Zeftawy RJacobs
!!Cuthin GHolahan TAlppolito k,*
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- C 2 Enclosure l TMI-1 AFW SEISMIC QUALIFICATION MEETING JANUARY 7, 1983 NRC GPUrl
-'UCS D3ii Van Vliet E! E. Braulke 1[ Pollard J. T. Beard R. F. Evers J. S. Wermiel T. M. Dempsey LLNL R. Lobel G. Copodanno PIER D. Snith M. Chiramal
_L. W. Harding Stephen Lu Med El-Zeftawy Ed Wallace John F. Stolz Rick Jacobs NCT Engineering Mack Cutchin (Tom) N. C. Tsai Gary Holahan -
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